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Lexer.cs
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Lexer.cs
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using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace cnpl
{
class Lexer : IDisposable
{
private SourceInputStream mInputStream = null;
private Queue<KeyValuePair<Token, string>> mBuffer = new Queue<KeyValuePair<Token, string>>();
private const string cn_number_table = "零一二三四五六七八九十百千万亿点";
public Lexer(SourceInputStream inputStream)
{
mInputStream = inputStream;
}
public void Dispose()
{
if (mInputStream != null)
mInputStream.Dispose();
}
public int Line
{
get { return mInputStream.Line; }
}
public int Column
{
get { return mInputStream.Column; }
}
public Token InputToken(out string text)
{
if(mBuffer.Count>0)
{
var b = mBuffer.Dequeue();
text = b.Value;
return b.Key;
}
text = string.Empty;
while (true)
{
var ch = mInputStream.Input();
if (ch < 0)
break;
if ((text.Length <= 0) && (char.IsWhiteSpace((char)ch) || ch == '\r' || ch == '\n' || ch == ' ' || ch == '\t'))
{
continue;
}
text += (char)ch;
if (text == "有一个数字")
return Token.有一个数字;
if (text == "有一个数字")
return Token.有一个数字;
else if (text == "有一句话")
return Token.有一句话;
else if (text == "有一个逻辑量")
return Token.有一个逻辑量;
else if (text == "有一个阵列")
return Token.有一个阵列;
else if (text == "有一种方法")
return Token.有一种方法;
else if (text == "接受输入")
return Token.接受输入;
else if (text == "取名为")
return Token.取名为;
else if (text == "行")
return Token.行;
else if (text == "列")
return Token.列;
else if (text == ";" || text == "；")
return Token.行结束符号;
else if (text == "." || text == "。")
return Token.段结束符号;
else if (text == ":" || text == "：")
return Token.冒号;
else if (text == "\\" || text == "、")
return Token.顿号;
else if (text == "," || text == "，")
return Token.辅助标点;
else if (text == "下列操作")
return Token.下列操作;
else if (text == "执行")
return Token.执行;
else if (text == "次")
return Token.次;
else if (text == "使用计数器")
return Token.使用计数器;
else if (text == "当")
return Token.当;
else if (text == "如果")
return Token.如果;
else if (text == "则")
return Token.则;
else if (text == "否则")
return Token.否则;
else if (text == "跳出循环")
return Token.跳出循环;
else if (text == "返回")
return Token.返回;
else if (text == "相加")
return Token.相加;
else if (text == "相减")
return Token.相减;
else if (text == "相乘")
return Token.相乘;
else if (text == "相除")
return Token.相除;
else if (text == "取余数")
return Token.取余数;
else if (text == "求余")
return Token.取余数;
else if (text == "等于")
return Token.等于;
else if (text == "不等于")
return Token.不等于;
else if (text == "大于")
return Token.大于;
else if (text == "小于")
return Token.小于;
else if (text == "或者")
return Token.或者;
else if (text == "并且")
return Token.并且;
else if (text == "而且")
return Token.并且;
else if (text == "设")
return Token.设;
else if (text == "的值为")
return Token.的值为;
else if (text == "的结果")
return Token.的结果;
else if (text == "的第")
return Token.的第;
else if (text.Length == 1 && ((ch >= '0' && ch <= '9') || ch == '+' || ch == '-'))
{
GetENumber(ref text);
return Token.V数字值;
}
else if (text.Length == 1 && (cn_number_table.IndexOf((char)ch) >= 0 || ch == '正' || ch == '负'))
{
GetCNumber(ref text);
return Token.V数字值;
}
else if (text.Length == 1 && (ch == '\'' || ch == '‘' || ch == '"' || ch == '“'))
{
GetString(ch, ref text);
return Token.V字符串值;
}
else if (text.Length == 1 && (ch == '[' || ch == '【'))
{
GetName(ch, ref text);
if (text == "[真]" || text == "【真】" || text == "[是]" || text == "【是】")
return Token.真;
else if (text == "[假]" || text == "【假】" || text == "[否]" || text == "【否】")
return Token.假;
return Token.V名称符号;
}
else if (text.Length == 1 && (ch == '<' || ch == '《'))
{
GetName(ch, ref text);
return Token.方法调用;
}
else if (text.Length > 50)
return Token.V_ERROR;
}
return Token.V程序结束;
}
public void ReturnToken(Token token,string text)
{
mBuffer.Enqueue(new KeyValuePair<Token, string>(token, text));
}
private void GetENumber(ref string text)
{
bool point = false;
while (true)
{
var ch = mInputStream.Input();
if (ch >= '0' && ch <= '9')
{
text += (char)ch;
}
else if(ch=='.' && (!point))
{
point = true;
text += (char)ch;
}
else
{
mInputStream.Return(ch);
break;
}
}
}
private void GetCNumber(ref string text)
{
bool point = false;
while (true)
{
var ch = mInputStream.Input();
if (cn_number_table.IndexOf((char)ch) >= 0)
{
if (ch == '点')
{
if (!point)
{
point = true;
text += (char)ch;
}
else
{
mInputStream.Return(ch);
break;
}
}
else
text += (char)ch;
}
else
{
mInputStream.Return(ch);
break;
}
}
}
private void GetString(int start, ref string text)
{
while (true)
{
var ch = mInputStream.Input();
text += (char)ch;
if ((start == '\'' || start == '"') && start == ch)
break;
else if (start == '‘' && ch=='’')
break;
else if (start == '“' && ch == '”')
break;
}
}
private void GetName(int start, ref string text)
{
while (true)
{
var ch = mInputStream.Input();
if (ch < 0)
{
mInputStream.Return(ch);
break;
}
text += (char)ch;
if (start == '[' && (ch == ']' || ch == '】'))
break;
else if (start == '【' && (ch == ']' || ch == '】'))
break;
else if (start == '<' && (ch == '>' || ch == '》'))
break;
else if (start == '《' && (ch == '>' || ch == '》'))
break;
}
}
}
}